Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b8398a8ba61a9f…

MALICIOUS

PDF

157.3 KB Created: 2021-05-29 06:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2e56d97ba2d7f5e02c1c3e33b135c51d SHA-1: 433708f161bc4a3a32bd5a4bd8f9e3b8eebf1d3f SHA-256: 32b8398a8ba61a9fbcb733592627512a20ac9c30c955fd35ca90bc25f57c8264
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely to host a malicious payload or phishing page. The document's content, though heavily obfuscated, appears to be a lure related to a literary summary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/strik?utm_term=two+gentlemen+of+verona+summary+class+11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470221/normal_604dde9b22055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_60311a5dd7a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fc7961b6b182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409092/normal_600e0644c0573.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413563/normal_5ffb5ab7bb7ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_60666d3864e14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_6041ab959ecac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60343109f2b32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_6018a3fbe0041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491723/normal_606089ce939dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_600f124002415.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4383464/normal_60b1a2810d8b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5fc68aea1cef6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5fe1c25f9c8fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_6046e66741bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476281/normal_603514f8ea9b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_60643c1807035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_60048eace38a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465392/normal_5ff51949600d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_600ecec2ad255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_6046c97649842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_6049a786db318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_601b808f15b20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000231ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231FF 5456 bytes
SHA-256: 336a2995812810ec5c65cd61bd155e1315ba8fc2f863c4e1ce54c78852586596
font_01_sfnt_off000244a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x244A1 10136 bytes
SHA-256: d9922e100b3a8cbffd579c79015102601e80346c7218563946c1fc2859738416

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